Finding the Fourth Proportional to 1,400.50, 2,100.71 and 426.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.50 : 2,100.71 = 426.46 : x
2. Step 2: Convert to fraction form
   1,400.50/2,100.71 = 426.46/x
3. Step 3: Cross multiply
   1,400.50x = 2,100.71 × 426.46
4. Step 4: Simplify right side
   1,400.50x = 895,868.79
5. Step 5: Solve for x
   x = 895,868.79/1,400.50
6. Step 6: Final answer
   x = 639.68